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    <title>Document</title>
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    li {
        float: left;
    }

    div {
        height: 25px;
    }
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<body>
    <div>
        <ul>
            <li>网站栏目1</li>
            <li>网站栏目1</li>
            <li>网站栏目1</li>
            <li>网站栏目1</li>
            <li>网站栏目1</li>
        </ul>
    </div>

    <div>
        <ul>
            <li>网站栏目2</li>
            <li>网站栏目2</li>
            <li>网站栏目2</li>
            <li>网站栏目2</li>
            <li>网站栏目2</li>
        </ul>
    </div>
</body>
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